As the beginnings of modifying TouchGraph to serve a more generalized
purpose, e.g. display of Topic Maps, I have added some code that allows you
to use a right click to select node type. There is an image of the results
thus far at
http://www.thinkalong.com/Nexist/TouchGraph2.gif

Next, I need to add double click functionality so that you can open a nodes
property sheet to see what the node contains.
Right now, I have three types of nodes: rectangle, round rectangle, and
oval. Maybe some more node types can be added.

Also, Nodes will take on different colors to color code Topic, Association,
Occurrence, and so forth.

When this coding is done, I'll make the source available to Alex for
whatever purpose he wants. Meanwhile, it's going in Nexist and another
Topic Map Engine that I have.